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B. V. NORDBYERG. AIR PUMP POR UONDENSERS.

No. 482,315. Patented Sept. 6, 1892.

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l B.- V. NORDBERG. AIR PUMP POR-GONDBNSERS.

No. 482,315.v Patented Sept. 6, 1892.

UNITED STATES PATENT OFFICE.

BRUNO V. N ORDBERG, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE BRUNONORDBERG COMPANY, OF SAME PLACE.

AIR-PUMP FOR coNDENsERs.

SPECIFICATION forming part of Letters Patent No. 482,315, datedSeptember 6, 1892. Application filed November 17, 1891. Serial No.412,147. (No model.)

To all whom t may concern:

Be it known that I, BRUNO V. NORDBERG, of Milwaukee, in the county ofMilwaukee and'State of W'isconsin, have invented certain new and usefulImprovements in Air-Pumps for Condensers; andl do hereby declare thatthe following is a full, clear, and exact description of the invention,which will enable others skilled in the art t0 which it pertains to makeand use the same, reference being had to the accompanying drawings, andto the letters of reference marked thereon, which form a part of thisspecification.

My invention relates to that class of pumps which is designed to beemployed in connection with condensers, vacuum driers or other apparatusin which a vacuum is to be produced and maintained in connection with,

the condensation of steam or vapor.

Its main object is to produce and maintain a more perfect vacuum thanhas been heretofore attainable in apparatus of this class.

It consists, essentially, of a valve-controlled opening or passage fromthe suction or condensing chamber into the pump-cylinder between thesuction and discharge valves, whereby air or other gas is discharged bythe pump without being forced through and encountering the resistance ofthe liquid in the pump-cylinder, and of certain other minor details ofconstruction and arrangement hereinafter particularly described, andpointed out in the claims.

In the accompanying drawings like letters designate the same parts inthe several iigures.

Figure 1 is a vertical medial section of a pump and condenser embodyingmyimprove- 5o wardly through a stufng-box in the upper head D of thepump-cylinder. The head D is provided with discharge-valves d d, openingupwardly into a chamber E, which holds a water-seal over the valves d dand communicates through an overflow-opening e with a Well F at one sideof the pump-cylinder, having an overflow opening or connection f in theside and a pump connection f at ornear the lower end for drawing off aportion of the Water or liquid, the greater portion of the Water orliquid and the air or gas being discharged through the opening f above.

G is the exhaust connection of the engine, vacuum-drier, or otherapparatus in 'which a vacuum is to be maintained with the upper portionof the condensing-chamber C.

H is a laterally slotted or perforated pipe or nozzle located above theexhaust connection G and arranged to introduce sheets or sprays of coolinjection-water for condensing the Steam or vapors entering the chamberC through the connection G.

c c are spreading-plates arranged to direct the intlowinginjection-water, so as to act most efficiently upon the inflowing steamor vapor. Heretofore in machines of this class the air or other gas hasbeen drawn, together with the water or liquid and any uncondensed vapor,by the pump through the suction valve or valves in the piston into thepump-cylinder, n0 provision being made for discharging it otherwise. Theair or gas being lighter than the water or other liquid to be dischargedby the pump in the manner last mentioned must displace a considerableamount ot' Water retained iu the pump-cylinder for the purpose ofsealing the suction-valves h b, and the force required to thus displacethe water or other liquid in discharging the air or gas correspondinglyimpairs or diminishes the strength of the vacuum produced and maintainedby the pump, because the pressure in the condensing-chamber C mustexceed the pressure in the pump-cylinderA between the suction anddischarge valves plus the weight of the column of Water above thepiston, to force air or gas from said condensing-chamber through thevalves in the piston and the Water resting thereon into thepump-cylinder.

To obviate the necessity of discharging the air or gas through the wateror liquid in the lower portion of the condenser and pump, I provideavalve-chamber K in one side of the pump-cylinder A, which chambercommunicates with the condenser C through ports or openings 7c and withsaid cylinder through similar ports or openings k. Thevalve-chamber K,for convenience of construction is preferably made cylindrical in formand applied in a horizontal position to the pumpcylinder. The ends,which are made open for the purpose of boring or finishing the interiorof the valve-chamber, particularly the valve-seat, are closed by screwcaps or plugs k2, as shown in Fig. 3. The openings or ports lo are madein the bottom of the valve-chamber and are normally closed by thegravity of a cylindrical valve L, which may be made of rubber or anyother suitable material. The valve L is guided upon its seat andretained in place by inwardly-projecting ribs 7c3. The ports 7c'preferably open from a passage I, which communicates through an opening'i with the upper end of the condensing-chamber C. By this meanscondensed steam and liquid passing through the condenser is eX- cludedfrom the air-valve K.

In operation liquid entering and vapor condensed in chamber C are drawntherefrom in the usual way through the opening a into the pump-cylinderwith each upward stroke of the above it. With each upward stroke of thepiston a portion of the contents of the cylinderA between the piston andhead D is expelled through the valves d into the chamber E, whence itpasses through opening e into the chamber F, the air or gases, with apart of the liquid,beingdischargedtherefromthroughthe opening f and theremainder of the water or liquid being drawn oif through the connectionf IVhen a sufficient amount of water or liquid has accumulated above thepump-piston B to afford a seal for the valves b b and to impede thepassage of air or gas, the latter will be drawn through the passage Iand valve-chainber K into the upper portion of the pump-cylinderwhenever the pressure in the chamber C exceeds the pressure in thepump-cylinder; or, in other words, whenever a more perfect vacuum occursin the pump-cylinder than in the chamber C. The valve L is easilydisplaced by any excess of pressure in chamber C; but when theconditions are reversed it immediately closes the ports k', preventingany backi'low from the pump-cylinder into said chamber C. By this meansand in the manner above stated a more perfect vacuum can be produced andmaintained than has been possible with pumps as heretofore constructedfor the purpose. It will be observed that the condensing-chamber C andthe well F are cast integrally with cylinder A.

Various changes in the details of construction and arrangement of myimprovement may be made within the intended scope of my invention, whichconsists, essentially, of the auxiliary air-valve hereinbeforedescribed.

The pump proper and condenser, in connection with which I have shown myimprovement, are in the main of a well-known construction; but thedevice may be adapted to pumps of various other forms forlike or similar purposes.

I claim- 1. In a pump for condensers, the combination, with thecylinder, piston, and suction and discharge valves, of acondensing-chainber havingan openinginto the space between the suctionand discharge valves of the pump and an air-valve placed in said openingand closing toward said condensing-chamber, substantially as and for thepurposes set forth.

2. In a pump for condensers, the combination, with an upright cylinder,an outwardlyopening discharge-valve, and a piston provided with aninwardly-opening valve, of a condensing-chamber communicating with thepump-cylinder through an opening into the space between the piston anddischarge-valve and an air-valve placed in said opening and closingtoward said condensing-chamber, substantially as and for the purposesset forth.

3. In a pump for condensers, the combination, with an upright cylinder,a condensingchamber communicating therewith, a piston provided with oneor more upwardly-opening valves, and an upper head also provided withone or more upwardly-opening valves, of a cylindrical valve-chamberformed in the side of the pump-cylinder, with open ends, which areclosed by caps or plugs, said valve-chamber communicating through a portin its under side with the condensing-chamber and through a lateral portwith the cylinder above said piston, and a cylindrical valve seated inthe lower side of said valve-chamber' and normally closing the port fromsaid condensing-chamber, substantially as and for the purposes setforth.

4. In a pump for condensers, the combina tion, with the cylinder,piston, suction and discharge valves, and a condensing-chambercommunicating with the lower end of the pumpcylinder, of a passageleading from the upper part of the condensing'chamber in a space betweenthe suction and discharge valves of the pump and an air-valve placed insaid passage and opening toward said space, substantially as and for thepurposes set forth.

5. In a pump for condensers, the combination of a piston provided withone or more upwardly-openin g valves, an upright cylinder provided withone or more outwardly-opening valves in its upper end and with ahorizontal cylindrical valve-case opening into said cylinder between thevalve or valves in its upper end and said piston, and acondensing-cham-TOO IIO

ber communicating` with the lower end of said cylinder and with saidvalve-chamber through' a port in the bottom thereof, and a cylindricalvalve seated by gravity over said port, opening toward said cylinder andclosing r0- Ward said condensing-chamber, substantially as and for thepurposes set forth.

In ytestimony that 'I claim the foregoing as my own I affix my signaturein presence of 1o two witnesses.

BRUNO V. NORDBERG.

Vitnesses:

CHAS. L. Goss, E. G. ASMUS.

